Is there a way to find topics/questions that you've responded/liked?

You can find out how by reading the Mangago Manual Book. You can just search for it! (=・ω・=)

You can find the things you've favourited by going to your homepage, and scrolling down until you see "Lolcatz101's favorite ( All 3 )". Unfortunately, there is so way to find the questions you liked. If you've resposed/followed a question, if someone else replies to it, it will show up in your notification bell

So, in the past when I'd comment on a topic, I'd automatically "follow" it and get notifications for other replies. Is there a way to find this when I never liked it?

no i dont think its possible on topics, it only gives notifs when you interact with it as in replying, only possible on questions ,that is if you decide to follow it

wait bro im back again if you followed the topic but never liked it you can find it again just scroll on your homepage and open your topics

Thanks!!